Add config only flag functionality

[chasefleming]

Closes #1588

flow init --config-only

---

For contributor use:

• [ ] Targeted PR against master branch
• [ ] Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• [ ] Code follows the standards mentioned here
• [ ] Updated relevant documentation
• [ ] Re-reviewed Files changed in the Github PR explorer
• [ ] Added appropriate labels

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 22 lines in your changes are missing coverage. Please review.

Project coverage is 38.60%. Comparing base (247ac54) to head (67fd36b).

Files	Patch %	Lines
internal/super/setup.go	0.00%	22 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## feature/interactive-init #1606 +/- ## ============================================================ - Coverage 38.84% 38.60% -0.25% ============================================================ Files 52 52 Lines 3501 3523 +22 ============================================================ Hits 1360 1360 - Misses 1969 1991 +22 Partials 172 172 ``` | [Flag](https://app.codecov.io/gh/onflow/flow-cli/pull/1606/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=onflow) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/onflow/flow-cli/pull/1606/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=onflow) | `38.60% <0.00%> (-0.25%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=onflow#carryforward-flags-in-the-pull-request-comment) to find out more.

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